房地产项目存在的环境污染问题及防治对策措施的探讨

阐述了房地产项目在建设期和施工期可能产生的环境污染问题,并提出了控制噪声、降低扬尘、污水处理等对策措施。     

确认制是预防事故的好方法

１确认是避免失误的有效方法一名泵工开泵送焦油,开泵以前先用蒸汽清扫泵出口管道,然后开泵送焦油。由于泵出口焦油压力比蒸汽压力大,焦油被压入蒸汽管道,又从蒸汽管道进入锅炉,由锅炉随蒸汽送往全厂。一时食堂的馒头上有了焦油,浴室的热水中有了焦油,洗衣房的水中...     

航空安全评估中的层次分析法—AHP

在航空公司安全评估中建立了影响飞行安全的层次结构模型 ,并利用层次分析法(AHP)对其进行了分析 ,得出了各个项目对公司的飞行安全的影响系数 (权重 ) ,为建立科学、公正的评估系统提供了理论支持。     

潞城市大气PM10中化学元素分布特征

利用ICP-AES分析了潞城市采暖期和非采暖期4个不同功能区PM10样品中16种化学元素,对不同元素的时空分布特征进行了研究,并采用富集因子和主成分分析初步研究了潞城市PM10中元素的主要来源.结果表明,潞城市PM10中重金属污染较为严重,且各元素在采暖期的平均浓度均明显高于非采暖期.PM10中Ca、V、Cr、As、N...     

TiO_2纳米管阵列光电极的制备及光催化性能研究

采用阳极氧化法在不同的条件下制备了TiO2纳米管阵列（TNT）光电极,利用SEM、XRD等手段对电极的表面形貌、晶体结构进行了分析和表征。以Rh.B为目标污染物,研究了不同电极的光催化和光电催化性能。结果表明：当氧化电压为20 V时,可获得形貌规则的有序排列的TiO2纳米管光电极,纳米管管径为80～120 nm;经50...     

Spatial and seasonal variations of polycyclic aromatic hydrocarbons in Haihe Plain, China

A dynamic fugacity model was developed to simulate the spatial and seasonal variations of PAHs in Haihe Plain, China. The calculated and measured concentrations exhibited good consistency in magnitude with deviations within a factor of 4 in air and 2 in soil. The spatial distributions of PAHs in air were mainly controlled by emission while the seasonal variations were dominated by emission and gas-particle partition. In soil, the spatial distributions of PAHs were controlled by the soil organic carbon content while the seasonal variations were insignificant. The severest soil contamination was observed in Shanxi and followed by the southwest of Hebei province. Transfer fluxes of total PAHs between air and soil were calculated. The spatial distribution of air-to-soil flux was closely related to the landcover while the soil-to-air flux changed with soil organic matter content. Monte Carlo simulation was done to evaluate the uncertainty of the estimated results in air.     

微波诱导催化剂Fe2O3／沸石氧化处理印染废水

以自制改性沸石为催化剂,通过微波诱导氧化技术,对活性嫩黄模拟废水进行氧化处理。采用尿素均匀沉淀包裹法制备Fe2O3／沸石微波诱导催化剂。利用SEM、XRD、IR等分析手段分别对催化剂的表面形态、物相结构等特性进行表征。实验考察了催化剂用量、微波辐射时间、微波辐射功率对活性嫩黄废水的降解效果。结果表明：在催化剂用量3g／L、微波功率900W、辐射时间4min的条件下,对50mg／L活性嫩黄的处理率达到97％。     

写好科技论文的英文摘要以提高被引率

科技论文英文摘要的编写要遵循一定的内容要求和句法要求。作者和英文编辑应该加强对英文摘要的重视,提高自身的英文水平,通过写好英文摘要来提高论文的被引率和期刊的影响因子。同时,编辑还要发挥对作者编写英文摘要的督促作用。     

Contribution of isoprene to formaldehyde and ozone formation based on its oxidation products measurement in Beijing,China

The atmospheric mixing ratios of methacrolein (MACR) and methyl vinyl ketone (MVK), the two specific products from isoprene oxidation in the atmosphere, were measured in Beijing from March to November, 2006. Distinct amounts of MACR and MVK were detected during vegetable growing seasons from April to October with ambient levels of 0.11–0.67 ppbv and 0.19–1.36 ppbv, respectively. The reacted isoprene and its ozone formation potentials (OFPs) in Beijing were evaluated in the range of 0.49–3.46 ppbv and 6.4–44.7 ppbv, respectively, from April to October. OFP of the reacted isoprene accounted for 10.6–23.6% of the total OFPs of VOCs (including carbonyls and isoprene) and 6.38–29.9% of the photo-chemically produced ozone. The maximum OFP of the original emitted isoprene prior to its photo-oxidation was calculated as 56.0 ppbv in August. The contribution from the reacted isoprene in Beijing to HCHO formation was also estimated to be in the range of 0.35–2.45 ppbv from April to October, which accounted for 4.6–11.5% of ambient HCHO.     

Measurement of machinery safety level: European framework for product control: Particular case: Spanish framework for market surveillance

Current brief aims to introduce the concept of safety in European industrial sectors, particularly in mechanics and machinery industry. It also highlights the importance to ensure an even level of machinery safety along the European Union, setting up the appropriate frame and procedures to keep it under control. An overview over market surveillance activities for machinery (regulations, main actors and their roles) first at Community level, and secondly an approach to one of the Member States is also introduced.